Structural factors determining the inhibitive effect of alkyl(aryl)ammonium salts of functionalized perfluoropolyethers

Abstract

Thirty homologous series of functionalized perfluoropolyethers (FP) based on alkyl(aryl)ammonium salts were studied, by correlation analysis and statistical data processing, as inhibiting constituents of perfluoropolyether lubricating greases. The basic adsorption and colloid-chemical factors responsible for the inhibitive effect of FPs are the high critical micell concentration, surface activity, hydrophobicity, and formation of chemoadsorption complexes, in which FPs function as electron-donating agents. Contributions from ten basic structural factors of FPs (carboxylate and arylsulfonate anions, electronic structure of an anchor heteroatom, active hydrogen atoms of NH- and OH-acids in aliphatic and aromatic fragments, aliphatic radicals, aromatic fragment in an alkylammonium cation, etc.), influencing their inhibitive effect in low-polarity media, were quantitatively estimated.